Pipe coupling component



. gasket around the adaptor member.

0 Unlted States Patent 1 1 3,542,080 [72] Inventors William H; Tomb;[56] References Cited Peter E. Wesel, and Anthony R. Zine, Jr., ns ATESPATENTS 2,703,774 3/1955 Morrison 156/84 [21] AppLNo. 763,467 3 206 3449/1965 ms 156/86 [22] F1led Aug.5,l968 3 376 055 4/1968 D 285/236Division ol'Ser No. 612,659, Jan. 30, 1967, now Pat. No. 3,419,291. IPrimary Examiner- Laverne D. Geiger [45] Patented Nov. 24, 1970Assistant Examiner-4!. J. Sher [73] Assignee Corning Glass WorksAttorneys-Clarence R. Patty,'-Jr. and William D. Fosdick Corning, NewYork a corporation of New York 1 ABSTRACT: A pipe coupling in which anannular beadlike adaptor member is held around the end of an unbeadedcylin- COUPLING COMPONENT drical section of glass pipe by means of ametal band bonded 31mm", 8 3 to the outer surface of the pipe andinterlocking with the adap- [52] us. Cl. 138/143, r mem er- The metalband is bonded to the glass by a com 156/84 posite adhesive medium whichincludes circumferentially [51 Int. CI...... Fl6l 9/14 r n glass fi rs na h a hrink ble material and axially [50] Field of Search 138/143, 1 rin glass fibers A second metal n m nt n a flexible Patented Nov. 24, 1970IP ll g. 3 INVENTORS WILLIAM H. TOMB PETER E. WESEL ANTHONY R. ZINE, Jr.BY

AGENT PIPECQUBLING COMPONENT v cRoss- EFEaENCE TO RELATED APPLICATIONThis-application is a division of my copending application Ser. No.612,659, filed on Janf 30, 1967, issuedas US Pat.

No. 3,419,291 on Dec. 31, 1968. I g

BACKGROUND OF THE INVENTION v The field to whichthis invention'pertainsis thatof pipecouplings influid handling systems, and more particularlycouplings having utility in joining unbeaded, cylindrical sec tions ofglasspipei- I I p j A common meansfor joining beaded sections of glasspipe is a coupling of th type described. in Canadian Pat; No. 691,860.In that coupling,- a metal band having inwardly tapered edge portionsbears upon aresilient annular gasket, which is bent by thejbandaroundthe beaded ends of the joined pipe sectionand urges them toward onean'othe'r to form a seal withan inwardly projecting rib onthe gasketSuchcoupling isnot satisfactory for use with unbeaded pipesec- DESCRIPTIONOF THE PREFERRED EMBODIMENTS Referring'in particular jtoj 1-3 of thedrawing, the coupling of the invention comprises a clamping band whichsurrounds the coupled ends of glass pipesections 12 and 14.

. Pipe section 12 isprovided with afbead 16at its end, while lions.Inasmuch as it is often inconvenient to form beads'on glass pipe,particularly when the pipe is cut at the site of installation, it isadvantag'eous'to have a coupling capable of joining cylindrical pipeends.

SUMMARY OF THE INVENTION According to the. invention, aconpling li avingutility in joining unbeaded pipe sections includes adiscrete beadlikeadap-- tor member which is placed around the end of an unbeaded pipesection and which is held in. place by an annular metal band which isbondedtothe outer surface of the glass.

' composite adhesive medium illustrated inFIG S. 4' and 5.

, Referring to FIGS. 4 and 5, composite adhesive medium 28 initiallycomprises five discrete layers. Each of the outer layers 30and 32comprises a modified acrylic copolymer resin which iscapable of beingsoftened and rendered adhesive by the action of heat and thesimultaneous absorption of a plasticizer, such as diallyl phthalate.Layer comprises a heat-softenable resin impregnated'with a multitude ofglassfibers, The glass fibers-are oriented such that each fiber extendsin a circumferential direction around the pipe end. Layer 36 comprisesaBetween the glass andthe band is a cortlp'ositeadhesive medij um. Theadhesive medium includes a layer having'a multitude of glass fiberportionsextending ina circumferential direction with respect to theband,'a heat-shrinkablelayer and-a layer of glass fibers oriented soasto'havea component in an axial direction with respect to, theband.;"lhe-heatshririkablelayer is laminated between-the layer having thelcircumfere'ntially oriented glass fibers andithe layer having'theaxially oriented glass fibers. When theheat-shrinkable materialiselevated in temperature itshrinks in anaxial'direc tion with respectto the pipe, causing the lc ir cumferentially oriented fibers to becomeI stackedin the area Iof the center of thejspace' between the standardfiber glass 'c'lothQwherein glass fibers are contained in a plasticmatrix. Some of the fibers in this layer are oriented so as to have acomponent extending in an axial direction with respect to the pipe. Eachof layers 34-and 36 contains diallyl phthalate as a plasticizing agentfor migration to layers 30fand 32. Layer38 comprises a heat-shrinkableplastic material. The live layers are pressed tightly together andcausedto adhere to. the inner surface of band. 26, prior to assembly of thecoupling, as illustrated in FIG. 8. v v v As shown in FIG. 4; glassfibers 40 initially are: spread out in an axial direction'withrespect topipe section 14. After band 26 'with' the' adhe'sive medium adhered toits inner surface is placed around'the-ends' cf pipe section 14, heat isapplied to "the interior of'thepipe sectionby means of a heating coil.The

assemblyis heated to' approximately 450F. When the assemblyreachesapproxirnately 200F., heafishrinkable layer 38 contracts in anaxial direction with respect to the pipe. Ad"

band and the glass, thereb'yincreasing the radial thickness of the layerof circumferentially oriented glass fibers, while decreasing the axialextent thereof. The result isthat these stacked glass fiberstightlypressoutejr adhesive layers. 'of the adhesive composite medium against theinner surface of the metal band and the outer surface of the' glass inorder to provide intimate contact between the adhesivelayer's and thesurfaces to which bonding is to be effecte d, The layer'of axiallyorientedglass fibers isfresistant'to contraction in theaxial direction,therebym 'aintaining the original axial extent of contact between thecomposite medium and the glass pipe.

BRIEF uEsc' InTIoN or TI-IEJDRAWING- FIG 1 is asidaeleyationalviewoftwosections of glass joined by acoupling'a'ccofding to the invention.

FIG. 2 is an axial sectional view throughthe coupling of FIG. 1 prior tothe tightening thereof.

FIG. 3 is a viewisimilar to that of FIG. 2 showing the couplingsubsequent to tightening."

1 FIG. 4 is an enlarged sectional view illustrating the com- I positeadhesive medium utilized in the coupling.

FIG. 5 is a view ofthecomposite adhesive medium of FIG. 4 subsequent tothe heating thereof. 7 FIG. 6 is a view similar to that of FIG. 3illustrating a modified coupling according to the invention. A 7

FIG. 7 is' a side view of the band used to hold the adaptor member inplace. j v

FIG. 8 is a perspective view of a component of the coupling at anintermediate stage of assembly of the coupling.

herence between layers 34 and 38 causes layer 34 to contract in the samemanner, thus tending tostack the glass fibers near the center of thecoupling, as illustrated in FIG. 5. The effect of the stacking of thefibers is to increase the'radial thickness ofithe compositeadhesivemedium, thereby forming-a tight fit between the adhesive'rnedium and the inner surface ofband 26 arid the outer surface of pipel4 When the temperature of the adhesive medium reaches '450F., theresins become plastic [and cure into a single integral structure.

,Layers' 30 and 32 may be formed as follows: 1200 grams or OR-2 5 0"Unithane White, obtainable from American Cyanamid Company are mixedwith 1824 grams of Polytex 913, obtainable from Celanese Corporation,and 416 grams of Solv esso I00, obtainable from Stoney-Mueller,Inc/Theresultant mixture "is ball milled approximately 16 hours,.a f terwhich 35 2 grams of Polylink 980, obtainable from Celanese.

Corporation, 224 grams of Solvesso 100,48 grams ofbutylalcohol, 4Qgramsof 2-6040. Silane, obtainable from Dow-Corning'Corporationfand .72 gramsof 2- Octanol are added to the mixture and the resultant mixture is ballmilled for Zhours. The resultant product is then painted onsilicone-treated paper to a thickness of approximately 1 mil and thecoated paper is warmedto approximately F. to dry the mixture;The'coatingcar then be. removed from the'paper for utilization theadhesive medium of the pipe coupling. v

Layer 34 may comprise parallel fibers of glass Owens-Corning typef893with polyester compatible sizing, impregnated with a mixture ofcatalizeddiallyl phthalate and a diallyl phthalate prepolymer, such asDapon, available from Ford Machinery Co'rporation Each fiber may extendaround the pipe through 360, or more numerous shorter fibers maybe used.Alternatively, a'single helical fiber may form a plurality ofrevolutions about the pipe.

Layer 36 may comprise Owens-Corning No. 181 fiber glass cloth, bolantreated, impregnated with diallyl phthalate. Since come of the fibers inthis layer are oriented so as to have a component extending in an axialdirection with respect to the pipe, the layer is resistant tocontraction in the axial direction thereby maintaining the originalaxial extent of contact between the composite medium and the glass pipe,as illustrated in FIG. 5. Alternatively. layer 36 may be fiber glasscloth with the glass fibers oriented unidirectionally parallel to theaxis ofthe pipe.

Heat-shrinkable layer 38 may comprise Dupont No. 65 HS Mylar*.

Rubber gasket 42 surrounds bead 16 and bead adapter 20 and has anannular inwardly projecting rib 44 located between the pipe ends. Rib 44is covered by a corrosion-resistant liner 46 formed ofpolytetrafluoroethylene. Gasket 42 is provided with an external annularchannel 48 to facilitate bending of the gasket around the bead adapter.

When clamping band is tightened about the pipe ends by means of bolt 50to the position illustrated in FIG. 3, the inner surfaces of itsinwardly tapered edge portions 52 and 54 bear against the edges of thegasket to bend the gasket around bead l6 and bead adapter 20, therebypressing both the bead and the bead adapter against gasket rib liner 46to form fluid-tight seals therewith. At the same time, the bead adapteris pressed tightly against the outer surface of pipe end 18 to form afluidtight seal between the inner surface of the bead adapter and theouter surface of the pipe.

The coupling of the invention is assembled by first pressing adapterretaining band 26 into interlocking relationship with the bead adapterDue to the fact that the tongue portion of the band is provided with aplurality of serrations 56, it is able to expand radially to permitaccess to the groove in the bead adapter After the band and the beadadapter have been locked together, adhesive medium 28 is pressed againstthe inner surface of the band. Due to the tendency of the layers of theadhesive medium to adhere to one another and to the inner surface of theband, the component comprising band 26, bead adapter member 20 andcomposite adhesive medium 28 may be retained as an integral unit untilit is subsequently bonded to a piece of pipe. Such bonding is effectedby placing the component over the ends of the pipe, drawing the band 26tightly around the surface of the pipe by pinching ear portions 58manually by means of pliers, and subsequently heating the assembly toapproximately 450F. to seal the composite adhesive medium to band 26 andpipe section 14 and to cure the polymers contained therein. Bead adaptor20 may be initially stretched over a rigid disk to maintain it in anexpanded state facilitating its placement over the pipe. The disk isremoved immediately prior to assembly of the component in a coupling, atwhich time the bead adaptor begins to shrink to its original diameter.

' The coupling of the invention may be utilized to join a beaded sectionof glass pipe to an unbeaded section of pipe. or to join two unbeadedsections. The latter arrangement is illustrated in FIG. 6, whereincylindrical pipe sections 60 and 62 are joined by means of bead adaptors64 and 66.

Inasmuch as further variations maybe made within the scope of theinvention, it is intended that the scope of the invention be limitedonly by the scope ofthe appended claims.

We claim:

1. A pipe coupling component comprising:

a. A generally cylindrical retaining band;

b. An annular beadlike adaptor member attached to said retaining band inthe vicinity of one edge thereof; and

c. A composite adhesive medium in proximity with the inner surface ofsaid retaining band, said medium including a plurality of discreteannular layers comprising:

cl. a first annular layer of material in proximity with the innersurface of said retaining band, said first layer having. at least onelay of a fiber comprisin a plurality of generally parallel portions,with each 0 said portions extending circumferentially with respect tosaid retaining band and being embedded in a thermoplastic matrix;and

c 2. a second annular layer of material adjacent to said first annularlayer on the side thereof opposite said retaining band, said secondlayer shrinking at least in an axial direction, with respect to saidretaining band, when heated.

2. A component according to claim 1 including, adjacent to said secondlayer on the side thereof opposite said first layer, a third layer ofmaterial having a lay of fibers embedded in a thermoplastic matrix, withat least a portion of said fibers being oriented so as to have acomponent extending in an axial direction with respect to said retainingband, thereby resisting contraction of said third layer in said axialdirection.

3. A component according to claim 2 wherein said fiber portions of saidfirst and third layers comprise glass fibers.

